Most "professional" way to provide constant voltage from a battery pack

[rthorntn]

Hi,

So say I have a 24V battery pack, I want to be able to use this pack to power a number of lower voltages, at least 12V, 16V & 19V, one voltage at a time.

The 24V pack is 11S LTO 2.3V, so it's actually 25.3V nominal, it charges up to about 29V and discharges to around 22V.

I see talk of SEPIC and lots of cheap buck boost converters but I don't really see anything that would provide up to 100W of reliable constant voltage that I can select?

Thanks.
Richard

[IanB]

If you search around the usual sources there are many variations on this kind of module with varying voltage and current ranges:

https://www.amazon.com/UCTRONICS-Numerical-Stabilized-Converter-Adjustable/dp/B01LWXAC5E

Is this the sort of thing you are looking for?

[rthorntn]

If you search around the usual sources there are many variations on this kind of module with varying voltage and current ranges:

https://www.amazon.com/UCTRONICS-Numerical-Stabilized-Converter-Adjustable/dp/B01LWXAC5E

Is this the sort of thing you are looking for?

Thanks IanB, I actually have one very similar to this, are they any good?

[rthorntn]

Thanks evb149!

Maybe the best way to do it is just have three seperate buck boards, one for each target voltage, high efficiency would be great also!

Any suggestions for something like that, over 90% efficiency buck circuit with selectable output voltage?

[bdunham7]

Get and examine one of these. See if it works well enough regarding efficiency and noise, then either use it or improve on it.  You can take this approach--an MCU-controlled variable buck, or you can just have a hardwired 3-voltage buck.  I wouldn't think you'd need to use 3 different boards to get good efficiency.

[John B]

Thanks evb149!

Maybe the best way to do it is just have three seperate buck boards, one for each target voltage, high efficiency would be great also!

Any suggestions for something like that, over 90% efficiency buck circuit with selectable output voltage?

I think you'd be wasting money on 3 separate buck modules. I would expect the FETs and inductors to cost a bit and so I wouldn't buy them 3 times over and have 2 lots sitting idle. I would use a synchronous buck controller with external FETs. Also, the controller might cost a bit, too. TI has some nice stuff but I have no idea about availability at the moment.